Bobeet williams aemsteong



(No Model.)

R. W. ARMSTRONG.

TRAP.

Patented May 15, 1883.

' Nm-:D STATi-:s

PATENT OFFICE.

IRELAND TRAP.

SPECIFICATION forning' part of Letters Patent No. 277,656, dated May 15, 1883.

Application filed September 2, 188'2. (No model.) Patented in England September 11, 1879, No. 3,644.

To all whom z't may co'ncern Be it known that I, ROBERT WILLIAMs ARMSTRONG, a, subject of the Queen of Great Britain and Ireland, and a resident of Belleek, in the county of Fermanagh, Ireland, have invented an Improved Trap for Urinal-Pans, YVaSh-Basins, Sto., (for which I have obtained Letters Patent as fo1lows:-for Great Britain and Ireland, No. 3,'64, September 11, 1879,) of which the following is a specification.

The object of my invention is to so construct a trap for urinals, sinks, wash-basins,&c.,that

the water will be kept at a desired level in the pan, an overflow -maintained at all times, and the automatic flushing or emptying of the contents of the pan effected in case of accident or intentional increase in the volume of supply- Water.

In the accompanying drawing is shown a longitudinal section of a urinal-pan with my improved trap.

A is the pan, which has the usual hollow rim communicating with the inlet branch a, so as to distribute the water throughout the pan. The pan has the usual discharge branch, d, which, however,is continued above the bottom of the pan in the form ofa tube,f, and the latter is inclosed by a cap, g, near the base of which are openings m. Water Will fill the pan up to the level of the top ofthe tube, andwill then overflow and escape through the outlet branch cl. Any rise in the level of the Water in the pan, tending to cause such an overflow as will fill the tubefand branch d, induces a siphoning' action and causes the withdrawal of almost all of the water from the pan, whereupon the siphon action will be discontinned and, the water will again rise to the proper level.

The cap g and tube f may form part of the main structure, and may be moided therewlith When said structure is made ofterra-cotta; or the cap may consist of a separate piece of earthenware; or in some cases the trap may form an independent self-contained structure, adapted for attachment to existing sinks,washbasins, urinal-pans, or other similar vessels.

VThe openings m should be smaller than the area of the tubef or the width of the passage between said tube and the cap, so that any forei`gn substances which will pass throngih the openings can be carried up over the top of the tube by the fiow of water orby theirbuoyancy.

The base of the cap or hood g is co'ntained Within a shallow reccss or depression, n, in the bottom of the pan, so that but a small quantity of water is needed to trap the pan, and on each flushing of the pipe all of the water is withdrawn from the pan, except the limited amount needed to form the trap, the retention 60 of a large body of foul water in the pan being" prevented. The openings m are convenient of access, so that clogging of the same or the accumulation of foreign matters in the trap can be readily prevented.`

I claiin as my invention- The Within-described trap for urinalpans, basins, &c., said trap eomprising a tube,f, projecting above the bottoin ofthe pan, and a cap or hood, g, inclosing said tube and having openings m at or near the base, which is contained in a shallow depression, n, in the bottom of the pan, as set forth.

In testimony whereoflhave signed my name to this specification in the presenceoftwo sub- 75. 

